The Big 4 Live from Sofia, Bulgaria is a DVD/Blu-ray featuring live concert performances by Metallica, Slayer, Megadeth, and Anthrax, collectively known as "the big four" of thrash metal.The event took place on June 22, 2010 at the Sonisphere Festival at Vasil Levski National Stadium, Sofia, Bulgaria. Before its DVD release, it was shown at 450 movie theaters in the United States and over 350 movie theaters across Europe, Canada, and Latin America on June 22, 2010. There was a limited-edition guitar pick unveiled shortly after the contents and artwork were released.
